Ever since I was young this has always been my favorite. It may seem weird to some people but the fat found in the marrow is the most nutritious part of the cow. It tastes pretty good too. Give it a try and you'll see.
How to prepare:
Roast ~3in bones in the oven at 400° F for about 20 minutes or until the marrow is fully cooked through. Browning the bones first will help improve the flavor of a bone broth, which I have yet to try.
You can also just choose to boil them in a large soup pot which will provide bone broth for a week. The meat, fat, bone and cartilage help to make a rich gelatinous broth.
Boil the bones till the marrow is cooked through which takes about 10-20 minutes (depending on the thickness of your bones) I scoop it out to enjoy and save the rest for later.